my %severity_map = (
    error=>'Warning',
    warning=>'Minor',
    critical=>'Critical',
    alarm=>'Critical',
    'system shutdown'=>'Fatal',
    'system powered off'=>'Fatal',
    failure=>'Critical',
    'memory bank deconfigured'=>'Warning',
    'uncorrectable ecc'=>'Fatal'
);
my @description_samples = (
    "Memory Bank Deconfigured",
    "Uncorrectable ECC",
    'DANGEROUS DILITHIUM STATE',
    "Sticky Corrected ECC Error",
    "SYSTEM SHUTDOWN"
);

for (@desctiption_samples) {
    my $severity = exists $severity_map{ lc($_) }?
        $severity_map{ lc($_) } : 'Warning';
    print exists $severity_map{ lc($_) } ?
        "Severity of $_ is $severity_map{ lc($_) }\n" :
        "No map found for $_: '$severity' level assigned.\n";
}